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ATtiny261A 데이터시트(PDF) 141 Page - ATMEL Corporation

부품명 ATtiny261A
상세설명  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  292 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny261A 데이터시트(HTML) 141 Page - ATMEL Corporation

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141
8197A–AVR–10/09
ATtiny261A/461A/861A
Figure 15-1. Analog to Digital Converter Block Schematic
15.3 Operation
The ADC converts an analog input voltage to a 10-bit digital value through successive approxi-
mation. The minimum value represents GND and the maximum value represents the voltage on
VCC, the voltage on the AREF pin or an internal 1.1V / 2.56V voltage reference.
The voltage reference for the ADC may be selected by writing to the REFS2:0 bits in ADCSRB
and ADMUX registers. The VCC supply, the AREF pin or an internal 1.1V / 2.56V voltage refer-
ence may be selected as the ADC voltage reference. Optionally the internal 1.1V / 2.56V voltage
ADC CONVERSION
COMPLETE IRQ
8-BIT DATA BUS
15
0
ADC MULTIPLEXER
SELECT (ADMUX)
ADC CTRL. & STATUS
REGISTER A (ADCSRA)
ADC DATA REGISTER
(ADCH/ADCL)
CONVERSION LOGIC
10-BIT DAC
+
-
SAMPLE & HOLD
COMPARATOR
MUX DECODER
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
+
-
ADC
MULTIPLEXER OUTPUT
GAIN
AMPLIFIER
INTERNAL 1.18V
REFERENCE
PRESCALER
SINGLE ENDED /
DIFFERENTIAL SELECTION
AGND
POS.
INPUT
MUX
NEG.
INPUT
MUX
ADC10
ADC9
ADC8
VCC
AREF
TEMPERATURE
SENSOR
INTERNAL 2.56/1.1V
REFERENCE
MUX
ADC CTRL. & STATUS
REGISTER B (ADCSRB)



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